golang/go

cmd/link: c-shared build mode not working with UPX

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#42,238 opened on Oct 27, 2020

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Description

What version of Go are you using (go version)?

Does this issue reproduce with the latest release?

Yes.

What operating system and processor architecture are you using (go env)?

What did you do?

I wrote a simple Golang file. is as follows:

package main
func main() {
}

Then build it : go build -buildmode=c-shared -o library.so main.go

After library.so created I want to compress it with UPX

run upx -9 library.so and got error

What did you expect to see?

92200 -> 49976 54.20% linux/amd64 library.so

What did you see instead?

upx: library.so: CantPackException: PT_NOTE 0xa71cc above stub

I opened a issue in GitHub UPX. They told me the problem the library.so does not have the correct format to allow compression.

This problem only when use -buildmode=c-shared in command-line.

Thanks.

Contributor guide

Research direction
Examine the PT NOTE section placement in the generated shared library and adjust the linker to place it appropriately for UPX compatibility.
Tech stack
go
Domain
backend
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
Goc shared build modeUPX
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
40